## Precalculus: Mathematics for Calculus, 7th Edition

$\log_5 4$ + $\log_5 s$ + $\log_5 t$
$Expand$ $the$ $expression:$ $\log_5 4st$ Rewrite the expression $\log_5 (4 \times s \times t)$ Apply the First Law of Logarithms $\log_5 (4 \times s \times t)$ = $\log_5 4$ + $\log_5 s$ + $\log_5 t$